<template>
	<Header></Header>
	<div class="courseContainer">
	    <div class="courseInfoTop">
	      <div class="info-container">
	        <ul class="route">
	          <li class="route-item" style="cursor: pointer">
	            <router-link to="/course" style="color: #fff">课程</router-link>
	          </li>
	          <li class="route-item"><el-icon><ArrowRight /></el-icon></li>
	          <li class="route-item" style="cursor: pointer">
                  {{ courseInfo.discountPrice ? '会员课程' : '免费课程' }}
              </li>
	          <li class="route-item"><el-icon><ArrowRight /></el-icon></li>
	          <li class="route-item">{{ courseInfo.courseName }}</li>
	        </ul>
	        <div class="name">{{ courseInfo.courseName }}</div>
	        <div class="info">
	          <div class="Avat">
	            <img src="@/assets/img/logo1.jpg" alt="" />
	          </div>
	          <ul class="teacherName">
	            <li class="name-item">
	              {{ courseInfo.lecturerName }}
	              <img src="@/assets/img/logo1.jpg" alt="" />
	            </li>
	            <li class="name-item">金牌讲师</li>
	          </ul>
	          <ul class="access">
	            <li class="access-item">难度</li>
	            <li class="access-item">高级</li>
	            <li class="access-item">·</li>
	            <li class="access-item">时长</li>
	            <li class="access-item">100个小时</li>
	            <li class="access-item">·</li>
	            <li class="access-item">学习人数</li>
	            <li class="access-item">200人</li>
	            <li class="access-item">·</li>
	            <li class="access-item">综合评分</li>
	            <li class="access-item">10.00</li>
	          </ul>
	        </div>
	      </div>
	    </div>

	    <div class="info-nav">
	      <div class="nav-container">
	        <div class="chapter-item" @click="handleTab('chapter')">
	          <div :class="active == true ? 'active1' : '' ">章节</div>
	          <div :class="active == true ? 'line active2' : '' "></div>
	        </div>
	        <div class="chapter-item" @click="handleTab('download')">
	          <div :class="active == false ? 'active1' : '' ">下载资料</div>
	          <div :class="active == false ? 'line active2' : '' "></div>
	        </div>
	      </div>
	    </div>
	    <div class="course" v-if="active === true">
	      <div class="main">
	        <div class="introduction">
	          <div class="desc">
	            该课程暂无介绍
	          </div>
	          <div class="btn">
	            <button class="btn-item active">立即购买</button>
	            <button class="btn-item">加入购物车</button>
	          </div>
	        </div>
	        <div class="video" v-for="item in courseInfo.bizCourseChapters" :key="item.id">
	          <div class="chapterName">{{item.chapterName}}</div>
	          <div class="chapterDesc">{{item.description}}</div>
	          <ul class="videos">
	            <li class="video-item" v-for="item2 in item.children" :key="item2.id">
	              <div class="video-itemIcon">
	                <i class="el-icon-video-camera"></i>
	              </div>

	              <div class="item-name">
	                <span class="shipin">视频：</span>
	                <span class="chapterName">{{item2.chapterName}}</span>
	                <span class="free" v-if="item2.chapterType == 2">试看</span>
	              </div>
	              <button class="btn-learn" @click="goPlay(item,item.id)">开始学习</button>
	              <div class="clearfloat"></div>
	            </li>
	          </ul>
	        </div>
	      </div>
	    </div>


	    <div v-else>
	      <div v-if="courseInfo.bizCourseAttachments.length">
	        <div class="down" v-for="item in courseInfo.bizCourseAttachments" :key="item.id">
	          <div class="source">
	            <span class="downloadCourse">{{ item.attachmentName }}</span>
              <img :src="src" />
	            <button class="downloadbtn" @click="downloadSource(item)">下载资料</button>
	          </div>
	        </div>
	      </div>


	      <div v-else>
	        <el-empty
	          description="该课程暂无资料"
	        ></el-empty>
	      </div>


	    </div>
	  </div>
	<Foot></Foot>
</template>

<script setup>
//组件
import Header from '@/components/common/Header.vue'
import Foot from '@/components/common/Foot.vue'
import { ArrowRight } from "@element-plus/icons-vue";
import { getDetail, checkAuth , downloadAttachment } from '@/api/CourseInfo/index'
import { onBeforeMount } from '@vue/runtime-core'
import { useRoute,useRouter } from 'vue-router'
import { useUserStore } from '@/store/user'
import { ElMessage } from "element-plus";
// 章节/下载资料的切换
let active = ref(true)
// 章节/下载资料的切换事件
const handleTab = ( type ) => {
    if(type == 'chapter'){
        active.value = true
    }else if(type == 'download'){
        active.value = false
    }
}

// 接受到路由的参数
const Route = useRoute()
const router = useRouter()
let courseId = Route.params.id

// 定义课程详情的数据
let courseInfo = ref({})

onBeforeMount(async ()=>{
    const res = await getDetail({ courseId })
    courseInfo.value = res.data.data
})

let src = ref('')

const downloadSource = async (item) => {
  let UserStore = useUserStore()
  if( !UserStore.token ){
    ElMessage.info({
      message: '请先登录'
    });
    router.push('/login');
    return 
  }
  const res = await checkAuth({ courseId : item.courseId })
  if( !res.data.data.hasAuth ){
    ElMessage.info({
      message: '无权限'
    });
    return;
  }
  const res2 = await downloadAttachment({ courseId:item.courseId, attachmentId:item.id })
  const blob = new Blob([res2]);
  let fileName = item.attachmentName;
  let fileUrl = item.attachmentUrl;
  const extName = fileUrl.substring(
      fileUrl.lastIndexOf('.')
  )
  console.log(fileName);
  console.log(fileUrl);
  console.log(extName);

  if(extName== '.gif' || '.jpg'){
    // 打开到浏览器上
    window.open(fileUrl)
    // 放在页面上
    // src.value = fileUrl
  }else{
    fileName = fileName + extName;
    const link = document.createElement('a');
    link.download = fileName;
    link.target = '_blank';
    link.style.display = 'none';
    link.href = URL.createObjectURL(blob);
    document.body.appendChild(link);
    link.click();
    URL.revokeObjectURL(link.href);
    document.body.removeChild(link);  
  }
}

const goPlay = (item , chapterId) => {
  //判断是否是登录状态，如果没有登录，进入登录页面
  if( !useUserStore().token ){
      ElMessage.info({
        message: '请先登录'
      });
      router.push('/login');
      return ;
  }
  //如果是登录状态
  checkAuth({
    courseId:item.courseId
  }).then(res=>{
    //如果没有权限，提醒购买
    if( !res.data.data.hasAuth ){
      ElMessage.info({
        message: '购买该课程才可以学习哦～'
      });
      return ;
    }
    //有权限
    router.push({
      path: '/course-play',
      query:{
        courseId: item.courseId  ,
        chapterId : chapterId
      }
    })
  })
}


</script>

<style scoped>
.courseContainer {
  width: 100%;
  height: 100%;
  background: #f8fafc;
  overflow: hidden;
}
.main {
  margin: 40px auto;
  width: 1200px;
  height: 100%;
}
.courseInfoTop {
  width: 100%;
  height: 200px;
  background-image: url("@/assets/img/logo1.jpg");
}
.nav-container {
  width: 1200px;
  margin: 0 auto;
  color: #333333;
  display: flex;
}
/* .chapter-item  .active{
    color: #388FFF;

} */
/* 背景部分开始 */
.courseInfoTop .info-container {
  margin: 0 auto;
  width: 1200px;
  height: 200px;
  color: #ffffff;
  z-index: 5;
}
.route {
  /*margin-left: 50px;*/
  padding-top: 20px;
  display: flex;
  font-size: 14px;
}
.route .route-item {
  margin-right: 10px;
}
.route-item a{
  text-decoration: none;
}
.name {
  margin: 30px 0 10px 0px;
  font-size: 24px;
}
.info {
  display: flex;
  /*margin-left: 50px;*/
}
.info .Avat {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}
.info .Avat img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}
.teacherName {
  margin: 8px 0 0 8px;
}
.name-item img {
  width: 14px;
  height: 14px;
}
.access {
  margin: 0 0 0 100px;
  display: flex;
}
.access .access-item {
  margin-right: 10px;
  line-height: 60px;
}
/* 背景部分结束 */

/* 导航栏开始 */
.info-nav {
  width: 100%;

  background: #ffffff;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.16);
}
.course {
  margin: 0 auto;
  width: 1200px;
}
.chapter {
  display: flex;
  font-weight: 600;
  color: #333333;
  margin-left: 50px;
  font-size: 20px;
}
.chapter-item {
  padding-bottom: 8px;
  font-size: 20px;
  font-weight: bold;
  line-height: 80px;
  margin-right: 70px;
  cursor: pointer;
  position: relative;
}
.chapter-item .active1 {
  color: #388fff;
}
.chapter-item .active2 {
  position: absolute;
  width: 70%;
  top: 63px;
  left: calc(30% / 2);
  height: 4px;
  background: #388fff;
  border-radius: 2px;
}

/* 导航栏结束 */
/* 课程介绍开始 */
.introduction {
  /*margin-left: 50px;*/
  /*padding: 20px;*/
  width: 1210px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.desc {
  padding: 20px;
  color: #474747;
  line-height: 35px;
}
.btn {
  float: right;
  margin-top: 10px;
  padding: 0 20px 20px;
}
.btn-item {
  width: 120px;
  height: 40px;
  /*margin: 0 20px 0 0;*/
  padding: 0px;
  border: 0px;
  outline: none;
  color: #f11d1d;
  border-radius: 23px;
  cursor: pointer;
}
.btn .active {
  background: #f11d1d !important;
  color: #ffffff;
  margin-right: 10px;
}
/* 课程介绍结束 */

/* 视频目录开始 */
.video {
  margin: 20px 0;
  padding: 20px;
  width: 1170px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.video .chapterName {
  font-weight: bold;
  font-size: 20px;
  color: #333333;
}
.video .free {
  padding-left: 20px;
  font-size: 14px;
  color: #388fff;
}
.chapterDesc {
  margin: 10px 0;
  font-size: 13px;
  color: #5c5c5c;
}
.video-item {
  height: 40px;
  line-height: 40px;
  padding: 5px 0;
  /*margin: 0 0 10px 0;*/
  border-radius: 8px;
}
.video-item:hover {
  cursor: pointer;
  background: rgba(53, 133, 255, 0.2);
  border-radius: 8px;
  color: #388fff !important;
}
.video-item .shipin {
  color: #333333;
  font-weight: bold;
}
.video-item .chapterName {
  font-size: 16px;
  font-weight: 400;
  color: #333333;
}
.video-itemIcon,
.item-name {
  float: left;
  padding-left: 10px;
}
.btn-learn {
  margin: 5px 5px 0 0;
  float: right;
  right: -100px;
  width: 80px;
  height: 30px;
  line-height: 30px;
  border: 0px;
  outline: none;
  color: #fff;
  background: #388fff;
  border-radius: 12px;
  cursor: pointer;
}
.clearfloat {
  clear: both;
}
/* 视频目录结束 */
.source {
  margin: 2px 0;
  padding: 5px;
  display: flex;
  justify-content: space-between;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.down {
  margin: 10px auto !important;
  width: 1200px;
  height: 100%;
  padding: 5px;
  background: #ffffff;
  box-sizing: border-box;
  border-radius: 8px;
}
.down:first-child {
  margin: 40px 0 5px 0;
}
.downloadbtn {
  width: 100px;
  height: 30px;
  line-height: 30px;
  background: #388fff;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
</style>